Get Amped! Prepare for the Upcoming HVAC – Heating, Ventilation and Air Conditioning Code Changes – Learn how Littelfuse can help with Industrial Products
Code Change – September 1st 2026 GFCI – Ground-Fault Circuit Interrupter Protection Requirements for HVAC go into Effect
On September 1st 2026, the 2026 NEC (National Electrical Code is the principal electrical installation standard used in the United States) will require GFCI protection on exterior, residential HVAC units. Standard GFCI breakers frequently nuisance-trip on inverter-driven and variable-speed equipment due to high-frequency leakage current. Shock Block SB4000™ solves this problem in a code compliant easy to deploy manner. SB4030-521-00 is described as SHOCK BLOCK CLASS A GFCI 208-240 by Littelfuse/Menbers for Residual-current circuit breaker and Fault Interrupter (FI) switch applications.